The host galaxy of GRB031203: a new spectroscopic study

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dc.creatorMargutti, R.
dc.creatorChincarini, G.
dc.creatorCovino, S.
dc.creatorTagliaferri, G.
dc.creatorCampana, S.
dc.creatorDella Valle, M.
dc.creatorFilippenko, A. V.
dc.creatorFiore, F.
dc.creatorFoley, R.
dc.creatorFugazza, D.
dc.creatorGiommi, P.
dc.creatorMalesani, D.
dc.creatorMoretti, A.
dc.creatorStella, L.
dc.date2007-09-03
dc.date2007-09-06
dc.date.accessioned2026-07-07T08:38:40Z
dc.date.available2026-07-07T08:38:40Z
dc.descriptionThe host galaxy of the long-duration gamma-ray burst (GRB) 031203 (HG031203) offers a precious opportunity to study in detail the environment of a nearby GRB. The aim is to better characterize this galaxy and analyse the possible evolution with time of the spectroscopic quantities we derive. We analyse HG031203 using a set of optical spectra acquired with the ESO-VLT and Keck telescope. We compare the metallicity, luminosity and star formation properties of this galaxy and of the other supernova-long gamma-ray burst hosts in the local universe (z<0.2) against the KPNO International Spectroscopic Survey. HG031203 is a metal poor, actively star forming galaxy (star formation rate of 12.9+/-2.2 {M_{sun} yr^-1) at z=0.1054. From the emission-line analysis we derive an intrinsic reddening E_{HG}(B-V)\approx 0.4. This parameter doesn't show a compelling evidence of evolution at a month time-scale. We find an interstellar medium temperature of 12500 K and an electronic density of N_{e}=160 cm^-3. After investigating for possible Wolf-Rayet emission features in our spectra, we consider dubious the classification of HG031203 as a Wolf-Rayet galaxy. Long gamma-ray burst (LGRB) and supernova hosts in the local universe (z<0.2) show, on average, specific star formation rates higher than ordinary star forming galaxy at the same redshift. On the other hand, we find that half of the hosts follows the metallicity-luminosity relation found for star-burst galaxies; HG031203 is a clear outlier, with its really low metallicity (12+\log{O/H}=8.12+/-0.04).
dc.description12 pages, 10 figures. Accepted by A&A
dc.identifierhttps://arxiv.org/abs/0709.0198
dc.identifierhttp://arxiv.org/abs/0709.0198
dc.identifierAstron.Astrophys. 474 (2007) 815-826
dc.identifierdoi:10.1051/0004-6361:20077698
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140811
dc.subjectAstrophysics
dc.titleThe host galaxy of GRB031203: a new spectroscopic study
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